There is nothing on the screen, it isn't a backlight problem. It just doesn't do anything, the LED does not come on.

I initially had a same problem with you.

Then I changed the USB cable (micro USB to USB); which connects your PC and the displaylink adapter, it works.

I have to say that the USB cable provided with the product is quite poor.

Thanks, I did try a couple of different cables but it didn't help. Tried different USB ports, hubs etc.